PDO::query

(no version information, might be only in CVS)

PDO::query --  Executes an SQL statement, returning a result set as a PDOStatement object

Описание

PDOStatement PDO::query ( string statement )

PDO::query() executes an SQL statement in a single function call, returning the result set (if any) returned by the statement as a PDOStatement object.

For a query that you need to issue multiple times, you will realize better performance if you prepare a PDOStatement object using PDO::prepare() and issue the statement with multiple calls to PDOStatement::execute().

If you do not fetch all of the data in a result set before issuing your next call to PDO::query(), your call may fail. Call PDOStatement::closeCursor() to release the database resources associated with the PDOStatement object before issuing your next call to PDO::query().

Список параметров

statement

The SQL statement to prepare and execute.

Возвращаемые значения

PDO::query() returns a PDOStatement object.

Примеры

Пример 1. Demonstrate PDO::query

A nice feature of PDO::query() is that it enables you to iterate over the rowset returned by a successfully executed SELECT statement.

<?php
function getFruit($conn) {
   $sql = 'SELECT name, colour, calories FROM fruit ORDER BY name';
   foreach ($conn->query($sql) as $row) {
       print $row['NAME'] . "\t";
       print $row['COLOUR'] . "\t";
       print $row['CALORIES'] . "\n";
   }
}
?>

Результат выполнения данного примера:

apple   red     150
banana  yellow  250
kiwi    brown   75
lemon   yellow  25
orange  orange  300
pear    green   150
watermelon      pink    90

Смотрите также

PDO::exec()
PDO::prepare()
PDOStatement::execute()



PDO::query
E. Rnie
22-May-2006 06:36
the above example does not function well...
it just returned
(
   [queryString] => "SELECT * FROM...."
)

with a trailing ->fetchAll() everthing is working fine...

the complete correct line:

foreach ($conn->query($sql)->fetchAll as $row) {
.
.
.
dozoyousan at gmail dot com
02-May-2006 10:26
> When query() fails, the boolean false is returned.

I think that is "Silent Mode".
If that set attribute ErrorMode "Exception Mode"
then that throw PDOException.
 $pdoObj = new PDO( $dsn, $user, $pass );
 $pdoObj->setAttribute("PDO::ATTR_ERRMODE", PDO::ERRMODE_EXCEPTION);
Nicolas Bérard Nault
05-Mar-2006 03:03
When query() fails, the boolean false is returned.

<PDO::preparePDO::quote>
 Last updated: Tue, 15 Nov 2005